Improve Your Wireguard Server's Performance

The default MTU(Maximum Transmission Unit) is 1420 in wireguard, while the most other devices use 1496 or 1500.
Read here for more info.
TL;DR
Stop the wireguard interface in use:

1sudo systemctl stop [email protected]
2# or
3sudo wg-quick down wg0

Edit the wireguard config file:

1sudo vim /etc/wireguard/wg0.conf

Add MTU=1400 to the Interface section like this:

1[Interface]
2Address = 10.10.10.1/24
3SaveConfig = true
4ListenPort = 51820
5MTU = 1400
6PrivateKey = xxxxxx

And start the stopped service:

1systemctl start [email protected]

Add the same for the client config.
Hope this helps.
Happy networking!